摘要
对Zr-4合金开展了常温与400℃高温下的低周疲劳试验研究,获得了两种温度下材料的单调R-O(Ramberg-Osgood)本构模型和M-C(Manson-Coffin)寿命估算模型。基于这些模型,研究了材料的循环硬化与软化特性,研究了静强度、循环强度、寿命的温度因子对Zr-4合金静强度、循环强度和低周疲劳寿命规律的影响效应;根据温度对寿命的影响因子与总应变幅呈线形规律的重要发现,修正了用于高温低周疲劳寿命估算的模型,进而总结出较现行方法更简便的高温疲劳试验方法。还研究了恒幅应变下幅值应力的温度效应。
A series of tests of bugle-flat specimens on the LCF (low cycle fatigue) behavior of Zircaloy-4 at room temperature and 400°C were investigated. Manson-Coffin (M-C) life estimation models and Ramberg-Osgood (R-O) monotonic constitutive models at room temperature and 400°C are given respectively. Systematical investigations about the influences of the elevated temperature on monotonic tensional intensity, cyclic intensity and fatigue life of Zircaloy-4 were performed by three temperature factors of the alloy related to the elevated temperature. According to acknowledge that it exists a linearity relationship between life temperature factor and strain amplitude, a modified M-C model for predicting the fatigue life at elevated temperature was proposed. In addition, the temperature effects of Zircaloy-4 on stress amplitude at 200-400°C were discussed.
出处
《航空材料学报》
EI
CAS
CSCD
2004年第5期1-6,共6页
Journal of Aeronautical Materials
